17996891191 has 2 divisors, whose sum is σ = 17996891192. Its totient is φ = 17996891190.

The previous prime is 17996891189. The next prime is 17996891207. The reversal of 17996891191 is 19119869971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17996891191 - 2¹ = 17996891189 is a prime.

Together with 17996891189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17996891291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8998445595 + 8998445596.

It is an arithmetic number, because the mean of its divisors is an integer number (8998445596).

Almost surely, 2^17996891191 is an apocalyptic number.

17996891191 is a deficient number, since it is larger than the sum of its proper divisors (1).

17996891191 is an equidigital number, since it uses as much as digits as its factorization.

17996891191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 61.

The spelling of 17996891191 in words is "seventeen billion, nine hundred ninety-six million, eight hundred ninety-one thousand, one hundred ninety-one".